Cylinder of internal-combustion engines



Feb 10, 1931. E. MANDLER CYLINDER OF INTERNAL COMBUSTION ENGINES so i929Filed Jan.

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WedndV/@V V/NWEN Patented Feb. r1,0, A1931 Sams " EUGNN MANDLER, onVIENNA;v AUSTRIA, AssiGNon To v'rianrinia cniilrnxfirroaon-r lPATENT*OFFICE ENwEnKn UND sQHiriiswnn-FT LrNzfA. ef., or VIENNA, Austernj ,4

CYLINDER or iNtenn-NAL-ooianUsufIoN nNGrNnsf Application flied Januaryso, 1929, seriai Nonsense,- ana in Austria-November 7, 1928;

My invention relates to acylinder for intermal-combustion' enginesespecially for twostrokecycleengines with the crank case used as ascavenging pump. In such engines the cylinder cooling jacket is commonlyprovided, as shown in Figure 4 of the accompanying drawing, so as to runparallel with the cylinder wall and to `terminate at the lower. end ofthe cylinder, the wall of the crank case extending from there obliquelyoutwardsl and downwards. In this case, only the cylinder can be cooled,whereas the cooling of the crank case cannot be obtained, this coolingbeing very important for the suction work of the engine, since the crankcase serves Aas an air pump. Furthermore in the struction above given,thejoint surfaces ofthe various open- Y ings on the side walls, siiclias cleaning holes,

:'example.. Figs. l and show' cylinder -be machined separately.

air inlets and exhaust opening, are situated in different planes so thatsaid surfaceshave to Furthermore, the bevelled surface of the cylinderrequires a relatively large amount of work in treating or finishing it,for example in painting it.

The main obj ect of my invention. therefore, f

is to avoid the above drawbacks by forming the cylinder cooling acket byrectilinear gen- 'f eratrices running from the periphery ofthe Y, uppercylinder flange tangentially to the outline of the crank case. By this.means a very effective cooling of the upper portionof'the crank case aswell as of the scavenging air channel and the air inlets, will. beobtained,

'asl the coolingspace extends furtherdownwards; The substantiallyrectilinear surface of the cylinder` obtained byfthis arrangement,

enables the several joint surfaceslocated on the sides of the cylinderto lie-simultaneously tooled or finished, so as to eiiect a considerablereduction of the cost of production. f Y.

Further objects ofliny invention will appear from thefollowing-detaileddescription.

. In Figures g1, 2 andB of theaccoinpany- Vlng drawings one form ofconstruction of the l n VTheVV Clingwwater pipes, are usuallygc'on;

nected tof a flange onV thecylinder, 'sucliasfgv k,-Fig.-4, andlocatedoutsidethe cylinder,

present invenaion isV represented by way of formed according to theinvention, in longi tudinal and cross section. VVFig. 3 is ahorizontalsection through 3 3 `Vin-Fig. 2. Fig. 4

`(Fig: 4). It is-,furtheran object ofgthejlin'- jvention to :provide,thev connecting flanges z' ofthe cylinder within the limits ofthegtwoplanes containingfthe.,above-mentioned.joint surfaces-sothat thetools'workingtl'iese.sur-:

ofthe kusual `formf.- e a According4 to Figa/4, 'the cylinder coolingjacketgm is'parallel tothe cylinder -wall-itl and terminates at thelower end Voiof the cylinobtained. .Furthermore ,thel scavenging fairchannel dis surrounded by the cooling water notonly on' its :narrowlateral faces, butalso V.on its rear side e.' 'The joint surfaces ofthecleaningholes c, the air'inlets b Vandthe-ex-` haus'topeningV r aresituated" in Vcommon i Yrepresents a cross section through a cylindervno Y Y.It will be seenthat by the vsaid .pockets l Vvery effectivecooling ofthe. air inlets -Zivis! f A planes fso as ,to be,simultaneously tooledfor `finishedl in oneworking strokeefthemachinetool.;V vs ,Il e, It is desirable to have a freey downward 5 y'excess ofstroke offithe Ytools vmachiningthe above-,mentioned joint surfacesl'flSuch a-.free

excess of stroke is usuallyrprevented bythe Y' Y forwardly'l projecting-'connecting Vflanges/' vfaces,`for example planing tools, milling cult-.A tersor grinding-wheels, have re down! Y fwardexcess-nf stroke. l Y f zIn addition tothe adyantagesabove indi-"jlHV cated a' considerableenlargement ofthelcool Y capable of resisting vibrations.

gine and are yexposedft'o damages.` They are .therefore avoidedaccording Ito the pres- ,ing space is obtained withoutincreasingthe/"YQO mainfdimension's of thecylinder, .and fur- Y, j.

thermore, as shown by acompa-risonbe tweenV j Figs 2 and- 4, .a-strongand pleasingV form,v j

- ,Suchv pipes impair the kusefulnessjof.y tlieenent invention, a`further object ofthe invention beingto provide one or more channels asto multi-cylinder engines. Y

What I claim is:

1.`An internal conibu'stion engine workv ing on the twostrokeY cyclecomprising in combination a cylinder,'a crankrcasehaving an upper partin kone piece `with the j'cylinder, the said crank Lcase fbeing intendedto be used as a scavengingpurnp, yair inletsfin the crank case, acylinder cooling j jacket having water pockets extending downl l wardsin the corners of the crank case to cool the said air inlets, anda waterinlet channel dium extending about the upper part of the crank case andthe air inlets therein and the cylinder and back andsides of thescavenging air channel, the outer surface of the cooling jacket beingformed by 4straight, lined gen-ratrices :extending from theuppercylinr-der ledge tangentially to the outline of the crank case, saidjacket being provided with water lpockets extending downwardly to thecorners of thecrankcase;

"In testimony whereof I have signed myname to this .speciiication Y fAEUGVEN MANDLER.

in open communication with one of lthe said water pockets'and extendingto the base of the saidnpperpart of the crank easel'` 2. An internalcombustion engine working on' the' two-stroke vcycle comprisinginvcombin'ation'a cylinder,a crank casehaving its upv per part in onepiece with thecylinder andthe j said crank casebeing intended to Ybeused as a 'scavengingpunip, a cylinder cooling vjacket having an outerwall'bounded by a surface `generated' by av Ystraight, line Vrunning"from f f5 the upper cylinder edgen tangentially to' the outline of thecrank case and :moving `round the cylinder, an air'inlet in said crankcase,

an exhaust Vpassage extendingi'rom the cylin- `der to the boundingsurface of the cooling jacket, cleaning holes in the outer wall of saidjacket and' machined 0joint@surfacesY in Vthe-said wallsurroundingtheend ci?. the exhaust p assage'therein, saifd air inletvandisaid y cleaning holes, said machined surfaces' lying '145 v locatedVvwithin/the,space'bounded byV these plainesI .l y j Y An internal incommon planes, and ljco'nnecting flanges airchanne'hl a jacket'f'for'acoolingfrnedium Y *enclosing the cylinder, back 2and sides Yof thescavenging airphannel andthe upper'part r v'ofthe crank case, the`outerfsuriace of the y cooling jacket beingfornied by straight linedgeneratricesj` running froinf the l,upper cylinider-f edge tangentiallyto' thev outline of the crank case,

=f4gAn` internal combustion engine work on the two stroke cycle 1,principle includfingv cylindenja crank case adapted to be fused` as ascavenging pun1p",za'scaveng1ngair 4lchannelfsaidv Vcrank lcase havingair inlet openings' therein, and a jacket forcooling mej combustion;engine work- Ving/"on the two strokef'cycleA principle includ- 1 1 ingfacylinder,` aV crankV case-adapte'dfto rbe" Y fused asa scavenging'pump,'a scavenging l

